Journal article
Authors list: Dieterle, M.; Witthauer, L.; Fix, A.; Abt, S.; Achenbach, P.; Adlarson, P.; Afzal, F.; Bartolome, P. Aguar; Ahmed, Z.; Annand, J. R. M.; Arends, H. J.; Bashkanov, M.; Beck, R.; Biroth, M.; Borisov, N.; Braghieri, A.; Briscoe, W. J.; Cividini, F.; Collicott, C.; Costanza, S.; Denig, A.; Dolzhikov, A. S.; Downie, E. J.; Drexler, P.; Gardner, S.; Ghosal, D.; Glazier, D. I.; Gorodnov, I.; Gradl, W.; Gunther, M.; Gurevich, D.; Heijkenskjoed, L.; Hornidge, D.; Huber, G. M.; Kaser, A.; Kashevarov, V. L.; Kay, S.; Keshelashvili, I.; Kondratiev, R.; Korolija, M.; Krusche, B.; Lazarev, A.; Lisin, V.; Livingston, K.; Lutterer, S.; MacGregor, I. J. D.; Manley, D. M.; Martel, P. P.; Metag, V.; Meyer, W.; Middleton, D. G.; Miskimen, R.; Mornacchi, E.; Mullen, C.; Mushkarenkov, A.; Neganov, A.; Neiser, A.; Oberle, M.; Ostrick, M.; Otte, P. B.; Paudyal, D.; Pedroni, P.; Polonski, A.; Powell, A.; Prakhov, S. N.; Reicherz, G.; Ron, G.; Rostomyan, T.; Sarty, A.; Sfienti, C.; Sokhoyan, V.; Spieker, K.; Steffen, O.; Strakovsky, I. I.; Strub, T.; Supek, I.; Thiel, A.; Thiel, M.; Thomas, A.; Unverzagt, M.; Usov, Yu. A.; Wagner, S.; Walford, N. K.; Watts, D. P.; Werthmuller, D.; Wettig, J.; Wolfes, M.; Zana, L. A.
Publication year: 2020
Journal: Physical Review Letters
Volume number: 125
Issue number: 6
ISSN: 0031-9007
eISSN: 1079-7114
Open access status: Hybrid
DOI Link: https://doi.org/10.1103/PhysRevLett.125.062001
Publisher: American Physical Society
Abstract:
The double-polarization observable E and helicity-dependent cross sections sigma(1/2) , sigma(3/2) have been measured for the photoproduction of pi(0) pairs off quasifree protons and neutrons at the Mainz MAMI accelerator with the Crystal Ball/TAPS setup. A circularly polarized photon beam was produced by bremsstrahlung from longitudinally polarized electrons and impinged on a longitudinally polarized deuterated butanol target. The reaction products were detected with an almost 4 pi covering calorimeter. The results reveal for the first time the helicity- and isospin-dependent structure of the gamma N -> N pi(0)pi(0) reaction. They are compared to predictions from reaction models in view of nucleon resonance contributions and also to a refit of one model that predicted results for the proton and for the neutron target. The comparison of the prediction and the refit demonstrates the large impact of the new data.
Citation Styles
Harvard Citation style: Dieterle, M., Witthauer, L., Fix, A., Abt, S., Achenbach, P., Adlarson, P., et al. (2020) Helicity-Dependent Cross Sections for the Photoproduction of π0 Pairs from Nucleons, Physical Review Letters, 125(6), Article 062001. https://doi.org/10.1103/PhysRevLett.125.062001
APA Citation style: Dieterle, M., Witthauer, L., Fix, A., Abt, S., Achenbach, P., Adlarson, P., Afzal, F., Bartolome, P., Ahmed, Z., Annand, J., Arends, H., Bashkanov, M., Beck, R., Biroth, M., Borisov, N., Braghieri, A., Briscoe, W., Cividini, F., Collicott, C., ...Zana, L. (2020). Helicity-Dependent Cross Sections for the Photoproduction of π0 Pairs from Nucleons. Physical Review Letters. 125(6), Article 062001. https://doi.org/10.1103/PhysRevLett.125.062001
Keywords
1ST MEASUREMENT; DOUBLE-PION-PHOTOPRODUCTION; ETA; MESONS; PHOTON; PROTON; SINGLE
